1.

Factorise (3a-7b-c)square using suitable identity

Answer»

ANSWER:

9a {}^{2}  + 49b {}^{2}  + c {}^{2} - 42ab \:  + 14bc  - 6ac

Step-by-step EXPLANATION:

(3a - 7b - c) {}^{2}

a {}^{2}  + b {}^{2}  + c {}^{2}  + 2ab + 2bc + 2ca



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